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0answers
20 views

What is the relative mass of a LiPo cathode?

Relative to the mass of a LiPo battery cell, how much is the mass of the cathode? That is, what is the percentage-mass of a LiPo battery's cathode?
0
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2answers
67 views

avoid Li-Ion batteries explosion

As a student group project, we are going to use Li-Ion batteries to test our charging and balancing circuit. These batteries at risk of explosion. How should we avoid that danger? Is there any ...
1
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1answer
99 views

Charging NiMH batteries with 1W solar panel, charge controller needed?

I want to know if a charge controller would still be needed despite the solar panel never outputting more than C/10 of current to the battery. This is a follow-up about my question here. The solar ...
0
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0answers
25 views

How is streaming potential measured?

This paper describes the measurement of streaming potential using a potential divider configuration. However it is unclear where the potential difference is created. From the diagram it appears that ...
2
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2answers
151 views

what is the Outer casing of alkaline battery made of?

what is the outer casing of a typical small 9v alkaline battery made of? Is it conductive?
0
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1answer
68 views

custom battery for CO2 generation

I want to design a small, cheap device that generates CO2 but I also want to capture the voltage to drive an LED. Any advice about which half-cell reaction I should use (oxalate?) or battery design. I ...
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1answer
78 views

Eneloop rechargable batteries for mouse? [closed]

I have a Apple Mighty Mouse, and I want to use rechargeable batteries, but I read somewhere on such a device I should only use Eneloop rechargeable batteries as they hold a charge when the device is ...
1
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0answers
58 views

Is lithium ion battery sutaible for all terrain vehicle

I have manufactured an all terrain vehicle.Is li-ion can sustain in the jerking of car,if battery is fully packed and waterproofed.If not,which battery should i use? Can i go for Li-polymer battery? ...
3
votes
2answers
106 views

How does a laptop maintain battery at full?

I know how a laptop battery becomes charged, however, I am not so sure how the power is maintained when when the battery has been charged to the maximum. I am unsure whether the laptop would switch ...
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3answers
416 views

Best kind of battery for electric motorcycle?

Sorry if this question doesnt belong here, I am new and learning. I want to try and build a DIY electric motorcycle, but am having issues finding the right batteries to use. I've tried searching for ...
0
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1answer
87 views

Understanding Battery rating

I need clarification regarding the rating of the battery shown in the below figure. I know battery ratings are given in Ah(Ampere-hour), but here it is given A/s. The picture is from "Linden's ...
0
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2answers
142 views

Difference in self discharge rate between Lithium iron phosphate battery vs Lithium Polymer Battery

What is the difference in self discharge rate between lithium iron phosphate battery and lithium polymer battery? I have a remote application in which the self discharge rate matters a lot.
0
votes
1answer
68 views

Lead Acid max discharge rate?

I am building a flashlight using a large(ish) 35W HID headlamp from a car, and I'm having troubles choosing a good battery technology. The inverter draws about 3.5A - 4A at 12V, tested on a large ...
0
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1answer
125 views

Is it OK to trickle charge a disposable battery [duplicate]

So I am playing around with designing a UPS when another question hit me. If I have a source feeding a small amount of current into a non-rechargeable battery is this OK. By OK, I mean is this ...
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3answers
164 views

Sanyo battery: what 430MH stands for?

I have a SANYO NI-MH battery from my Oral-B toothbrush. I reads 430MH. Now I'm curious what does 430MH stand for? Im thinking its probably nickel–metal hydride if ...
2
votes
1answer
109 views

Is there an easy way to protect a PCB from leaked electrolyte?

I've come across a LED flashlight that has rather curious design. The flashlight is rather powerful - it can notably heat up in "turbo" mode and so the driver definitely deals with some serious ...
2
votes
2answers
153 views

Alkaline cells vs. LED flashlight

I have (had, actually) an El Cheapo pocket LED flashlight powered by 3 AAA cells. It was shipped with very low quality "salt" cells (regular, low weight - someone please suggest a proper English name ...
0
votes
2answers
300 views

is a higher voltage battery a more efficient energy deliverer than a lower voltage battery?

a DC electric motor moving a car. will it experience the same torque with current provided from a 4V battery with a capacity of 1000 Ah as with current provided from a 400V battery with a capacity of ...
0
votes
1answer
147 views

relationship between battery voltage and discharge rate

I guess my question roots from me not understanding what a load represents to the battery. Is a 4V battery able to discharge at a higher rate (C rate) than a 2V battery? Or does it completely depend ...
1
vote
2answers
194 views

Best value Lithium ion/polymer cells/batteries

I've built a sound reactive, android controlled, wearable RGB LED matrix/suit which I'm currently powering with a rather heavy 12V 3Ah SLA battery. I'm looking to switch to lithium or ni-mh packs and ...
4
votes
1answer
195 views

The voltage of capacitor across battery never reaches battery voltage

I made some homemade vinegar batteries. The voltage of each cell was measured around 0.45V. I have 18 of them in series and I measured around 6.5V for the whole chain. Since the vinegar batteries ...
6
votes
2answers
668 views

New alkaline batteries with 10-year shelf life—what's changed?

I'm finding that some new alkaline batteries, such as the new Duracell Duralock and Energizer Power Seal batteries, have a shelf life of 10 years. Most other alkaline batteries have a shelf life of 7 ...
4
votes
2answers
623 views

How fast may I trickle charge a full LSD NiMH battery?

I've bought two packages of low-self-discharge nickel-metal hydride AA batteries, each made by a different well-known battery manufacturer. Sadly, the datasheets aren't very detailed: • One ...
4
votes
1answer
1k views

Lithium-ion rechargeable battery, shelf life

For Lithium-ion rechargeable batteries, that have never been charged, or been charged like 2-3 times at most, some 2-3 years back, and having since-then been in packaged condition, what should I ...
3
votes
1answer
100 views

What makes primary batteries leak on very deep discharge?

From my experience, if a primary (alkaline or zink) battery is left in a device with very low consumption (like a remote control, or a quartz watch) then at some point all the energy is drained and ...
2
votes
1answer
187 views

Can a lead-acid battery charger be used for “Gel” type?

I have a PB-600-24 lead acid battery charger. Can I use it for the battery type that has an image as below? 4 of the batteries are in series.
6
votes
1answer
205 views

If I turn a AA around will it drain or damage electronics?

I have an Apple Bluetooth keyboard. The thing turns on all the time when I put it in my backpack. This is bad because it blocks the soft keyboard on my phone. It runs on 2 AA batteries. Lately, I ...
5
votes
3answers
738 views

Why does connecting batteries in series result in doubled current sourcing while shorting?

I have Duracell Ultra Power AAA batteries, current draw is around 2.5A when shorting for single unit. I have just tried connecting them in series and parallel then measure discharge current. ...
3
votes
2answers
198 views

Electrons' flow misconception?

Conductors have a single electron in the last band, these electrons get pushed forward by electrons coming from the source (Battery), each electron pushes its neighbor and so on. Current is the flow ...
17
votes
3answers
6k views

What's the highest theoretical energy density for a chemical battery?

This is more a physics/chemistry/nanotech question, but what's the theoretical best energy density you could get out of a chemical battery (or fuel cell), if you could arrange atoms in any manner you ...